Omron RX User Manual page 226

4-3 Functions When PG Option Board (3G3AX-PG01) Is Used
Sensor Vector Control (Speed Control)
To use this function, set V/f characteristics selection A044 to "05" (V2), and V2 control mode selec-
tion P012 to "00" (speed control).
("Sensor vector control" can be selected for 1st control only.)
To use this function, make sure that the motor parameter settings are suitable for your motor. Refer
to Inverter model RX user's manual "Chapter 4 Functions, 4-2 Function Mode, Motor Parameter Se-
lection".
Also, be sure to set the number of your encoder pulses.
With V2 control mode selection P012, you can select four types of control modes: Speed control,
4
Pulse train position control, Absolute position control, and High-resolution absolute position control.
Note the following before use:
• Sufficient characteristics may not be obtained if you select a motor size two or more ranks lower than
the maximum applicable motor size.
• If the Inverter does not normally accelerate, or if overload protection is activated, check the phase order
of the encoder signal.
(If phase A is advanced by 90° from phase B during forward run, it is judged as being normal.)
When running the Inverter with V/f characteristics selection A044 set to "00" (VC), you can check
the rotation direction with real frequency monitor d008.
(If positive frequency is detected when the forward command is activated, or if negative frequency
is detected when the reverse command is activated, the rotation direction is judged as being
normal.)
If sensor vector control cannot provide the desired characteristics, adjust the motor parameters de-
pending on the phenomena, as shown in the table below.
Operation status
During startup
During
deceleration
During
torque limit
Low-frequency
operation
Related functions
Note 1: Make sure that the carrier frequency (b083) is not lower than 2.1 kHz. If the carrier frequency is at 2.1 Hz
or lower, the Inverter does not operate normally.
Note 2: To use a lower rank motor size than the Inverter, set a torque limit value (b041 to b044), while keeping
the value α, calculated with the following formula, at 200% or lower. Otherwise, the motor may burn out.
α = Torque limit set value × (Inverter capacity) / (Motor capacity)
(Example) If the Inverter capacity is 0.75 kW and the motor capacity is 0.4 kW, the torque limit set value
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Phenomenon
Shock occurs during
Reduce motor parameter J from the set parameter.
startup.
Reduce the speed response.
Motor hunting
Reduce motor parameter J from the set parameter.
Insufficient torque at low
Set a overload limit level lower than that of the
frequency during torque
torque.
limit
Rotation is not constant. Increase motor parameter J from the set parameter.
A001, A044, F001, b040 , H002, H003, H004 , H020 , H021 , H022 ,
for α = 200%, calculated with the above formula, is as follows:
Torque limit set value (b041 to b044) = α × (Motor capacity) / (Inverter capacity)
Adjusting method
H023 , H050 , H051 , H052 , P011, P012
= 200% × (0.4 kW)/(0.75 kW) = 106%
Adjustment item
H024/H034
H005
H024/H034
b021
b041 to b044
H024/H034